REMOVE Instruments in External View on Bush Trip Missions

My Instrument Heads Up Display in Chase Cam is Turned OFF in ASSISTANCE OPTIONS / USER EXPERIENCE.
Once I start a Bush Trip Mission the External Hud is back ON.
Option is still turned OFF in ASSISTANCE OPTIONS / USER EXPERIENCE but is GRAYED OUT.

Does this mean MSFS is FORCING me to have this HUD in External View?

If so then WHY?